(window.onresize = function rem(doc, win) {
  var docEl = doc.documentElement,
    resizeEvt = "orientationchange" in window ? "orientationchange" : "resize",
    recalc = function () {
      var clientWidth = document.body.clientWidth;
      if (!clientWidth) return;
      // docEl.style.fontSize = 100* (clientWidth / 1920) + 'px';
      if (clientWidth <= 1360) {
        docEl.style.fontSize = "71px";
      } else {
        docEl.style.fontSize = 100 * (clientWidth / 1920) + "px";
      }
    };

  if (!doc.addEventListener) return;
  win.addEventListener(resizeEvt, recalc, false);
  doc.addEventListener("DOMContentLoaded", recalc, false);
})(document, window);
